Calculating hydrogeological parameters on the basis of trial injection test as an example of Chuandong Gas Field

With the increasing extraction natural gas, gas water, as the by-product, becomes an urgent problem to be solved. Produced-water reinjection is the most active treatment method. Groundwater environmental impact assessment in domestic is still in its early stage. Based on the groundwater dynamics theory, formation pressure obtained by water reinjection test was analyzed to get the inherent laws between formation pressure and water head, and a new method of calculating hydrogeological parameters was proposed. As an example of Chuandong Gas Field, this study get an improved application by converting formation pressure-time curve to water head-time curve on the basis of trial injection test and groundwater flow theory, that is, Bernoulli equation and Theis equation for unsteady groundwater flow.